Elastomers Flashcards
(24 cards)
material properties of neoprene
-chemical resistance
-heat resistance
-shock absorber
-water resistance
-flexability
Material properties of silicone
- steam resistance
-chemical resistance
-thermal conductivity
-toxicity – flexible
Material properties of natural rubber
-durable
- absorbent resistance
-high tensile strength
Name 5 types of themo polymers
- acrylic
-silicon
-epoxy resin
-polyester
-Melamine formaldehyde
Name 2 Elastomers
-rubber
-lycra
Define thermo polymer
A polymer that can be formed into different shapes when heated over and over again
Define thermoset polymer
- a polymer that can only be formed or moulded once
Define elastomer
A natural or synthetic polymer having elastic properties
They return to their original form once deformed or shaped
What are the disadvantages of crude oil
-economic issues
-price is controlled by oil companies
-poor countries lose economic control
What is cracking
It’s a process in which larger chains of hydrocarbons are broken down into smaller and more useful molecules
What is a polymer?
A continuous chain of monomers
What is a monomer
A single molecule - the building blocks of all plastics
What is vulcanisation
A chemical process in which rubber is hardened to keep its shape
State the steps of vulcanisation
1) rubber is mixed with sulphur
2) rubber is exposed to high temperatures
3) The sulphur atoms form links/bridges between….
(CONTINUE)
Who discovered vulcanisation ?
Charles Good year
What is the MP and SWT of Polystyrene Resin ?
MP-260
SWT-15
What is the MP and SWT of HIPS ?
MP:150
SWT:120
What is the full form of HIPS ?
High Impact Polystyrene
What is the MP and SWT of Epoxy Resin ?
MP:115
SWT: 21
What is the MP and SWT of nylon?
MP:220
SWT:100
What is the MP and SWT of LPD?
MP:115
SWT:16
What is the full form of LDP?
Low density polystyrene
Why is Telfon a suit suitable material for cooking and frying?
Because it has a high melting point of 327°C
Name the six stock forms
Foam
filament
granules,
sheets,
film
powder
